President Trump unveiled his plans for the Golden Dome missile defense system and said he plans to have the $175 billion system operational by the end of his term.

US President Donald Trump's plan for a nationwide missile defense system -- dubbed "Golden Dome" -- faces significant technical and political challenges, and it could cost far more than he has estimated to achieve its goals.

Orbiting in space, American satellites detect the bright flames. While the missile is still in its “boost” phase, one of a network of space-based interceptors fires down a laser, or alternative munition, to blow up the threat. America sleeps soundly, protected by its Golden Dome.